About Duct Connections
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About Heat-Shrink Tubing
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Tapered Heat-Shrink Tubing
- Material: Polyolefin Plastic
- Shrink Ratio: See Table
- Dielectric Strength: 200 V/mil
- Shrink Temperature: 250° F
- Temperature Range: -65° to 275° F
A different shrink ratio on each end allows this tubing to fit over cable assemblies and wire harnesses with large connections, or around connectors with a 90° elbow. An adhesive lining melts when the tubing is heated and bonds to the underlying surface, creating a water-resistant seal. The tubing length listed is after shrinking; the length before shrinking is 20-25% shorter.
Lipped tubing has a ridge on the inside of one opening for better retention than non-lipped tubing. It’s often used with grooved adapters—upon shrinking, the lip grips onto the groove.
Dielectric strength is the maximum voltage a material can handle before it starts to breakdown.
Tapered End | Non-Tapered End | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Style | ID Before Shrinking | Min. ID After Shrinking | Shrink Ratio | ID Before Shrinking | Min. ID After Shrinking | Shrink Ratio | Min. Wall Thick. After Shrinking | Color | End Style | Lg. | Each | |
| D | 1.25" | 0.28" | 4.5:1 | 1.25" | 0.75" | 1.7:1 | 0.09" | Black | Lipped | 1.4" | 0000000 | 000000 |
| D | 1.25" | 0.28" | 4.5:1 | 1.25" | 0.75" | 1.7:1 | 0.09" | Black | Non Lipped | 1.4" | 0000000 | 00000 |
| D | 1.5" | 0.33" | 4.5:1 | 1.5" | 0.75" | 2:1 | 0.1" | Black | Lipped | 1.7" | 0000000 | 00000 |
| D | 1.5" | 0.33" | 4.5:1 | 1.5" | 0.75" | 2:1 | 0.1" | Black | Non Lipped | 1.7" | 0000000 | 00000 |
| D | 1.75" | 0.38" | 4.6:1 | 1.75" | 1.1" | 1.6:1 | 0.13" | Black | Lipped | 2.1" | 0000000 | 00000 |
| D | 1.75" | 0.38" | 4.6:1 | 1.75" | 1.1" | 1.6:1 | 0.13" | Black | Non Lipped | 2.1" | 0000000 | 00000 |
| D | 2" | 0.62" | 3.2:1 | 2" | 1.6" | 1.3:1 | 0.13" | Black | Non Lipped | 3" | 0000000 | 00000 |
| E | 3" | 0.86" | 3.5:1 | 3" | 1.41" | 2.1:1 | 0.18" | Black | Non Lipped | 5" | 0000000 | 000000 |
Standard Duct and Fittings
No need for clamps or connectors—duct and fittings press-fit together. Male ends are crimped or tapered, making them slightly smaller than a female end for simple assembly.
Galvanized steel has good corrosion resistance. Aluminum is more lightweight than steel and stainless steel and has good corrosion resistance. 304 stainless steel is more corrosion resistant than steel and aluminum.
For technical drawings and 3-D models, click on a part number.
Connectors with welded seams prevent leaks.
| Duct Size | Female ID | Male OD | Features | End Construction | Gauge | Each | |
Galvanized Steel | |||||||
|---|---|---|---|---|---|---|---|
| 14 | 14" | 13 7/8" | Welded Seams | Tapered | 20 | 00000000 | 0000000 |
| 16 | 16" | 15 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
| 18 | 18" | 17 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
| 20 | 20" | 19 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
| 22 | 22" | 21 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
| 24 | 24" | 23 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
Aluminum  | |||||||
| 3 | 3" | 2 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
| 5 | 5" | 4 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
| 7 | 7" | 5 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
| 10 | 10" | 9 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
| 12 | 12" | 11 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
| 14 | 14" | 13 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
304 Stainless Steel | |||||||
| 14 | 14" | 13 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
| 16 | 16" | 15 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
| 18 | 18" | 17 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
| 20 | 20" | 19 7/8" | Welded Seams | Tapered | 20 | 00000000 | 00000000 |